Diana Nyad is off again.<br/> <br />After saying goodbye, the U.S. endurance swimmer is on her fifth attempt to swim from Cuba to Key West, Florida.<br/> <br />Accompanied by a small fleet of five support boats and a crew of 35, the 64-year-old is braving sharks, man o'wars and poisonous jelly fish, among other challenges.<br/> <br />Jellyfish stings sank her last attempt at the 103-mile (166-kilometer) swim, but this time she's wearing a protective silicone mask.<br/> <br />(SOUNDBITE) (English) DIANA NYAD, SWIMMER, SAYING:<br/> <br />"I think I have some luck in my favor with Mother Nature. And I'm ready and the jellyfish protection that we've spoken about-- better than it's ever been. I think it's going to help me get through those animals."<br/> <br />Nyad says this will be her last attempt.<br/> <br />Only one other swimmer has swum the Florida Straits. Australian Susie Maroney conquered the swim with a protective cage in 1997.
